The son of Nathan Pritikin, founder of the Pritikin Longevity Center, has introduced a plan, which limits fat intake to 10-15 percent of total calories and encourages consumption of a very high volume of complex, fibrous carbohydrates. His claim is based around the "Fat Instinct," a biological drive to overeat high-fat foods and avoid exercise.

Advantages:
The plan recommends choosing lean cuts of meats over higher-fat varieties. This is sound advice and helps to lower caloric intake, which may reduce the risk of coronary heart disease.

Disadvantages:
Due to the high volume of bulk in the diet, swelling of the stomach occurs very quickly, leading to early termination of the meal, thereby reducing the number of calories consumed. While a low-fat diet is certainly healthful, very few people can stay satiated for a long period of time on diet with only 10-15 percent of calories coming from fat. This may lead to overeating and consumption of calories above a level necessary for weight maintenance.

Long-term Success:
Not everyone will feel good on such a low-fat diet. This will lead to overeating of calories above maintenance levels and weight gain.

The Pritikin Weight Loss Breakthrough was created by Robert Pritikin.